Forging machine



Oct. 2, 1934. w. w. CRILEY 1,975,537

FORGING MACHINE Filed March 15, 1932 2 Sheets-Sheet l Jil/iam M65-Zay ATTORNEYS Oct. 2, 1934. W w CRlLEY l 1,975,537

FORGING MACHINE Filed March 15, 1932 2 Sheets-Sheet 2 ATTORNEYS.

refereed oei. 2, i934 1,975,537

UNITED STTES PATENT FFICE FORGING MACHINE William W. Criley, Cleveland,Ohio Application March 15, 1932, Serial No. 598,963

5 Claims. (Cl. 'Z4-585) The purpose of this invention is to provide aomitting the spring and spring mounting; Fig. 5 safety release forforging machines. This type is a diagrammatic plan View of the positionof of release is, in general, well known and comparts in theintermediate collapsing position of prises a linkage system in a thrust:member of a Fig. 2; Fig. 6 corresponds to Fig. 5 but shows the 5forging machine by which the links are normally final, fully collapsedposition; and Fig. rl is a 60 maintained in position to deliver astraight thrustI vertical section indicated by the line 7--7 of Fig. butin which in case the thrust load is exceeded 4; and Fig. 8 is a verticalsection indicated by the linkage system will move so that the unthe line8-8 of Fig. 1. delivered thrust movement will be absorbed in In thepreferred form here shown and del repositioning the linkage membersinstead of scribed, the safety release is illustrated as ap- 05 breakingthe machine. The mechanism used in plied to the die actuating slide 1 ofa forging this invention, in common with others which are maCllDe 2 Ufthe 'type Where in the header Slide directed to this type of safetyarrangement, in- 3 movable longitudinally of the machine, and the cludesa strong spring which normally holds the di@ Slide 4, transverselymovable, are both actul members of the linkage in extended position andated from @0111111011 transl/EIS@ Shaft 30,- Fg. 1. 70 upc. which theStress ai, normal loads is less In the form here illustrated the slide 1is moved than the strength of the spring. to die-closing position by acam 32 Working In earlier types of this sort of release mechaagainst aIOllel' 31, in a rearward extension 1A nism the arrangement has usuallybeen wastef lille Slide, and lS retracted by 911011161" Cam 33 20 ful 0fSpace and diilgult t0 asgeynble, and, fur.. Which bfal'S against theback Of the Slide, 110i] 75 ghermore, has. necessitated a Completeresetting shown. The shaft 30 also drives vthe header slide of thespring pressure after every time that the 3 by'aCIDk 34 ThisConstruction being Well unsaiety arrangement has been disconnected toset ClelSOO in the all", Only the Dart 0f the machine the dies to whichthis invention is directly applied is illus- In the present invention Ihws@ mis Spring trated in detail. The die slide 4 is driven from 80 andits connections entirely in the actuating slide le di@ actuating Slide 1by a toggle Composed of or cross head, and, furthermore, so arrange thea bed plate knuckle 5 and die Slide knuckle 6. plvparts that the springpressur may be released, oted respectively to the machine frame at 'Iandto for setting dies, and afterwards made effective the die Slide at 3and joined by a DVOG 9 t0 Which 3Q again without loss of the originaladjustment. a @Onnectlng link l0 fl'Om Jib@ actuating Slide 1 85 Also,after the spring has been removed it may is also pivoted, this linkbeing pivoted at its be replaced af, its former adjustment. wihout otherend at 11 to the safety release mechanism. needing any adjustment-, Thesafety mechanism includes a three-part To the accomplishment of theforegoing and linkage 12, 13, 14, a Spring 15 dhd21 Spring mOuntrelatedends, said invention, then, consists of the ing 16. 17, 13, all Carriedby the atllalng Sli-de 90 means hereinafter fully described andparticular- 1- Unde normal @Ondf/OH these parl/S d0 not ly pointed outin the claims. move with relation to one another or to the actu- Theannexed drawings and the following deating slide during the movement ofthe actuating Scription Set fgrth. in detail Certain mechanism, Slide,but llnflel OVeIlOad Conditions the OlWaId o embodying the invention,such disclosed means movement of the slide 1, instead of moving the 95constituting, however, but one of various melink and thus spreading thetoggle 5, 6, ccmchanical forms in which the principle of the inpressesthe spring and re-arranges the linkage vention may be used. against theopposition of the spring. The link- In the accompanying drawings Fig. 1is a parage is mounted upon the slide 1 by pivots 19 and tial plan viewof a machine to which this inven- 20, as shown in Fig. 8 and asindicated by shading 10G tion is applied, the safety release being shownin Figs. 4, 5 and 6, fixed to the slide, and the link in normalposition, that is, not released; Fig. 2 elements are mutually connectedby movable is a view similar to Fig. 1 showing the safety pivots 11, 21and 22. The linkage and the spring release acting under an overload whenfurther are interengaged by a trunnion block 23, the trunmovement of thedie is stopped, the parts being nions of which turn in one arm 24 of abell 19E in extreme position but not final released posicrank lever onthe pivot 20. In detail, the link tion; Fig. 3 is an enlarged sideelevation of the element 12, known as the relief knuckle, is apsafetyspring rod and associated parts, the spring proximately triangular in.plan view,v having at itself being omitted from this gure; Fig. 4 is aeach apex a bearing to receive, respectively, the plan view of thelinks, corresponding to Fig. 1, but pins of pivots 19, 11 and 21. Thepivot 2i is con- 110 nected to the link 13, the other end of which isconnected by the pivot 22 to the longer arm 14 of the bell crank lever,14, 24, pivoted at 20 and having a shorter arm 24 with bearings atitsouter end on journals 25 on the trunnion block 23. 'Ihe arm 14 is knownas the relief lever and the arm 24 as the relief lever arm. The latteris bifurcated, being conveniently constructed with a detachable top 24',as shown in Fig. 7. Thus by unfastening and lifting ofi the the topplate 24' the trunnion block may be disconnected from the arm 24 bysimply lifting out the rod 16 and the block 23 with it.

The relief spring 15, a compression coilspring, surrounds the rod 16which is threaded at each end and which carries at one end a threadedwasher 17 and at the other a nut and lock nut, 18 and 18. These nuts areclear of the trunnion block 23 except when the pressure of the spring 15is to be taken ofi" the linkage. The trunnion block 23 is sleeved freelyon the rod 16. The spring 15 bears at its opposite ends against anenlarged head 23 of the trunnion block and against the washer 17,respectively. Thus the linkage cannot collapse into the positions ofFigs. 5 and 6 until the relief lever arm 24 has moved counterclockwise,compressing the spring 15. The short end of the rod 16 which extends tothe left of the washer 17 is seated in the front wall of the actuatingslide 1 as indicated at 26, Fig. 3. It will be noticed from Figs. 1 and2 that the linkage is below the plane of the top edge of the cam slide.Provision is made in the sides and ends ci' the cam slides to allowthese parts to assume the positions shown.

A preferred form of mechanism to limit the clockwise movement of thepivot 22 about the pivot 20, and thus to keep it slightly below deadcenter so that the joint at 22 will break outward, toward the headerslide, instead of toward the spring, comprises a stop 27 formed on oneedge of a shelf 28 in the upper part of the slide l. The upper end ofthe pivot pin 22 is correspondingly flattened as shown in Figs. 1 and 2to engage against. this stop. Thus the movement of the trunnion block 23to the right, Figs. 1 and 3, is limited by the stop 27 and not by thenut 18.

A description of the operation of the device follows. Under normalconditions the spring 15 and the linkage 12, 13, 14 maintain thepositions shown in Figs. l and 4 in every position of the travel of theactuating slide 1. Under overload continued forward movement of theslide l swings the relief knuckle 12 counterclockwise about the pivot19, breaks the toggle 13, 14 away from the stop 27, swings the bellcrank 14, 24 counterclockwise, and moves the trunnions 25 to the left,compressing the spring 15. This is the intermediate position, shown inFig. 5, passed through on the way to the full collapse position of Fig.6.

When the relief knuckle 12 has swung to the position of Fig. 5 thepivots 19, 21, 22 are aligned with 21 a triiie to the right of the line19-22, so that a tcggle exists here which will break to the right underthe pressure of the spring 15, either with or Without further resistanceof the link l0. The longitudinal component of movement of the pivot l1from the position of Fig. 4 to that of Fig. 6 is equal to the entireforward travel of the actuating slide 1, so that even if an obstructionto the die movement is encountered when the movable die is in full openposition, no damage will be done.

To re-set the safety mechanism from the position of Fig. 6 to that ofFig, 4, the slide 1 is run rearward, to the right in the figures. Theinertia of the movable die holding the link 10 and pivot 11 swings theknuckle 12 clockwise. about the pivot 19 just enough to break the togglejoint at 21 over dead center and slightly to the left of the 8i)position of Fig. 5, whereupon theexpansion of the spring 15 snaps thelinkage back to the position of Fig. 4. To throw out the safety devicefor setting dies the spring pressure is taken ont' the linkage bysetting up on the nut 18 until the 85 spring thrust is taken on thelinkage and held entirely by the nut. Then by moving the pivot 22 byhand away from the stop 27 the safety can be thrown out so that thetravel of the actuating slide can be taken up in the linkage while the9@ movable die remains full open on the forward stroke of the headerslide, as is necessary at times in the operations of setting dies andcentering tools. This does not alter the spring adjustment, which isgoverned solely by the position of g5 the washer 17. Thus again slackingoff the nut 18 to the position o1 Fig. 3 leaves the safety all ready towork again without readjustment.

To change the spring adjustment the nut 18 is run up to lock with thenut 18 and the two 100 are then used to take a wrench for turning therod 16. The set screw of the washer 17 having been released and thiswasher having been held against rotation, rotation of the rod 16 movesthe washer in the proper direction. When the correct m5 setting is hadthe set screw is locked down and the nuts 18, 18 slacked oii.

1n dismounting the safety spring and its connections, the nut 18 istightened up to move the trunnion block in and so take the pressure ofthe 'H0 spring off the linkage, the relief lever arm top 24' is removedfrom the relief lever arm 24 and the bottom trunnion 25 is lifted out ofits bearing. The socket 26 holds the end of the rod 16 with sideclearance, allowing the needed freedom of M5 movement for theseoperations. The rod 16, with the spring 15 thereon, is taken out and thespring pressure gradually released by backing oli the nut 18 until thespring is free, after which the nut can be taken 01T the rod, thetrunnion 23 12 taken on, and the spring removed.

Other modes of applying the principles of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly' point out and distinctly claim as myinvention:

l. A safety device for a machanism of the type described comprising aplurality of interconnected toggles on a common movablepowertransmitting'support, said toggles being adapted to transmitthrust, and resilient means for maintaining said toggles extended, saidtoggle system and said resilient means being enclosed in common limits,a mounting for said resilient means comprising a carrying element and aconnector to said toggle system, said carrying element being carried atone end by said connector and at the other by said common support, saidconnector being movable relatively to said support by force applied tosaid toggle system and also by the force of said resilient means, andmeans for conning the force of said resilient means to stress 14:5 uponthe carrying' element.

2. A reciprocating safety mechanism for transmitting thrust, comprisingin combination a slide, driving and driven connections thereto, a togglesystem within said slide, and means for prevent- 15@ ing collapse ofsaid system underpredetermined loads, said means including a spring, acarrier whereon said spring is mounted, a connecting member between saidspring and said toggle system freely slidable on said carrier, anotherelement on said carrier movable longitudinally thereof and engageablewith said connecting member, and longitudinally successive positivecontact means between said last-named element and said carrier.

3. In a safety mechanism of the type comprising a thrust-transmittingslide, two interconnected toggles pivoted thereto and a spring adaptedto hold said toggles immovable against ordinary working loads, springmounting means comprising a rod disposed longitudinally through saidspring, a threaded Washer on one end of said rod constituting anabutment for said spring, a slidable trunnion block on the other end osaid arm and pivoted to a toggle link, a nut threaded on the other endof said rod and movable into engagement with said block to take thepressure of said spring off said toggle link, and removable connectingmeans between said link and said trunnion block.

e. In a forging machine having a die actuating slide, a safety releasecomprising a linkage and a spring all mounted on said slide andcontained therewithin, a rod, said spring being mounted upon said rodand said rod being mounted at one end in said slide, an end seat forsaid spring on said rod and adjacent one end thereof, and a blockslidable on the other end, said spring tending to move said block in adirection away from said end seat, said linkage including an arm pivotedto said block, and a stop on said slide adapted to coact with saidlinkage to limit the movement impressed on the linkage by said spring.

5. A safety device for a mechanism of the type described comprising athrust-transmitting slide including a housing portion, a front and arear pivot thereon, two interconnected toggles, one member of eachtoggle being carried by one of said pivots,4 said toggles being adaptedto transmit thrust, and resilient means for maintaining said togglesextended, said resilient means being disposed immediately adjacent thetoggle system and housed entirely within the housing of said system, anabutment on said housing in advance of said front pivot, and a trunnionpivoted to an arm of said toggle system, the pressurerof said resilientmeans being taken at one end on said abutment and at the other end onsaid trunnion, said resilient means being compressible when the thrusttransmitted by said slide meets With extraordinary resistance.

WILLIAM W. CRILEY.

